docs: def init_rotate(cls, radians):
          """Return a new :class:`Matrix` for a transformation
          that rotates by :obj:`radians`.
  
          :type radians: float
          :param radians:
              Angle of rotation, in radians.
              The direction of rotation is defined such that
              positive angles rotate in the direction
              from the positive X axis toward the positive Y axis.
              With the default axis orientation of cairo,
              positive angles rotate in a clockwise direction.
  
          """
          result = cls()
          cairo.cairo_matrix_init_rotate(result._pointer, radians)
          return result